Version 5.0.1 does not work with PHP 7.4

The newly released 5.0.1 version of the plugin claims it is still compatible with PHP 7.4:

=== Auto Featured Image (Auto Post Thumbnail) ===
Contributors: themeisle
Tags: post thumbnails, featured image, elementor, thumbnails, featured image from title
Requires at least: 5.6
Tested up to: 6.9
Requires PHP: 7.4
Stable tag: 5.0.1

However, using it with PHP 7.4 leads to a fatal error:

PHP Parse error:  syntax error, unexpected ':', expecting ')' in wp-content/plugins/auto-post-thumbnail/src/Settings.php on line 102

It works properly with PHP 8.0 and later. Please fix and include PHP 7.4 in your testing.